JPH0219751B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing studs, which are mainly used for attaching lining materials to metal plates such as steel plates.

(Prior Art) As illustrated in FIG.
It has a constriction part 14 between the collar part 11 and the head part 13, and the shaft part 12 is welded to a base material, for example, a steel plate to which a lining is applied. The lining material is then held between the flange 11 and the steel plate. Further, the head 13 is torn off from the constricted portion 14 after the welding described above. The constricted portion 14 constitutes a fragile portion for this purpose.

However, since the conventional stud 1 was an integrally forged product in which the collar portion 11, the shaft portion 12, the head portion 13, and the constriction portion 14 were formed at the same time, the diameter D ₁ of the shaft portion 12 shown in FIG. In comparison, the diameter _D2 of the flange portion 11 could not be too large. In practice, D ₁ = 10
If it is mm, it was forged so that D ₂ = about 24 mm. On the other hand, as shown in FIG.
The diameter d ₁ of the hole 210 drilled in the lining material 200 for welding is determined by the diameter d 1 of the hole 210 to facilitate welding work and to prevent thermal expansion and contraction of the lining material 200 between the shaft portion 12 and the hole 210 .
For the sake of convenience such as absorbing the distance A from the wall surface of the shaft 12, it is generally considered that the diameter _D1 of the shaft portion 12 is approximately twice as large. So D ₁ as above
= 10 mm, by setting the diameter of the hole 210 of the lining material 200 to about d ₁ = 20 mm, it becomes easier to perform the welding work and the above-mentioned thermal expansion/contraction absorption effect can be fully exerted. However, in this case, even if the shaft portion 12 is accurately aligned with the hole 210, as is clear from the figure,
The catching width L between the flange 11 and the lining material 200 is only 2 mm, which is a sufficient catching width L.
It becomes impossible to secure Further, in this case, if the alignment is not performed accurately, a part of the flange 11 may come off from the lining material 200, which may cause the lining material 200 to peel off.
Therefore, attempts have been made to reduce the diameter of the hole 210 to about 16 mm. If you do that,
If the above-mentioned alignment is accurate, the above-mentioned catching width L will increase to 4 mm, but the above-mentioned interval A will become narrower (A=2 mm), and the lining material 200
There is a risk that it will not be possible to reliably absorb the thermal expansion and contraction of. However, since the alignment requires skill, in practice, the shaft portion 12 is placed at the eccentric location of the hole 210.
is often set, and in that case, there will be a place where the above-mentioned catching width L is insufficient, and in an extreme case, as shown in FIG. Minimum catching width L _nio in contact with
is 1mm, and at this point the flange 11 and the steel plate 10
In this state, the lining material 200 is hardly sandwiched between the two.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and in the above-mentioned case, even if the alignment is not accurate, a sufficient catching width and a sufficient thermal expansion/contraction absorption effect can be ensured. The problem that needs to be solved is to make it possible.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the gist of the present invention is to join an integrally forged product of a flange, a head, and a constriction to a shaft forged product.

(Function) According to the above means, since the collar and the head are constructed by joining different forged products, the diameter of the collar can be determined independently of the diameter of the shaft. Therefore, there is no restriction on making the diameter of the flange larger than the diameter of the shaft. In other words, the diameter of the shaft can be made extremely small compared to the diameter of the flange, and even if the diameter of the hole in the lining material is reduced accordingly, the distance between the shaft and the wall of the hole allows for sufficient thermal expansion and contraction as described above. It becomes possible to ensure the absorption effect. In addition, the above-mentioned catching width can also be ensured sufficiently.

(Example) FIG. 1A shows an integrally forged product consisting of a die-forged collar portion 11, head 13, and constricted portion 14, and FIG. 1B shows a shaft forged product consisting only of the shaft portion 12. ing. The present invention provides a stud 1 as shown in FIG.
This is what you get. The joining is done by appropriate means such as stud welding.

In such a stud 1, the diameter D ₃ of the shaft portion 12
and the diameter _D4 of the flange 11 do not affect each other during the manufacture of the stud 1, so the diameter of the shaft 12
The diameter _D4 of the collar portion 11 can be made sufficiently larger than _D3 . Therefore, when such a stud 1 is used for attaching a lining material, it is necessary to increase the diameter of the hole in the lining material to provide a sufficient distance between the shaft portion 12 and the wall of the hole. The hanging width L is ensured. Therefore, the lining material 200 does not peel off, and a sufficient thermal expansion and contraction absorption effect is ensured.

For example, the diameter D ₃ of the shaft portion 12 shown in FIG.
is 8 mm, the diameter D ₄ of the flange 11 is 30 mm, and the diameter d ₃ of the hole 210 of the lining material 200 shown in FIG.
If D is set to 16 mm, which is twice D ₃ , even if the shaft portion 12 is eccentric with respect to the hole 210 and contacts the wall surface of the hole 210 as shown in the same figure, the minimum catching width L _nio is 3 mm.
Therefore, if there is a catching width of this degree, the flange part 1
1 and the steel plate 100 can sufficiently perform the clamping action. In addition, if the shaft portion 12 is accurately aligned with the hole 210, the distance between the shaft portion 12 and the wall surface of the hole portion 210 will be 4 mm, so that the above-mentioned thermal expansion and contraction absorption effect is sufficiently ensured. Become. From this, the diameter d ₃ of the hole 210 of the lining material 200
When is twice the diameter D ₃ of the shaft part 12, the flange part 1
It can be said that if the diameter D ₄ of 1 is set to about 3 times or more of D ₃ , a sufficient catching width L and thermal expansion/contraction absorption effect can be ensured.

(Effects of the Invention) As detailed above, according to the present invention, it is possible to manufacture a stud whose collar portion has a sufficiently large diameter compared to the diameter of the shaft portion, so it can be suitably used for attaching a lining material. Studs can be easily obtained. Note that the use of studs manufactured according to the present invention is not limited to only for attaching lining materials.

[Brief explanation of drawings]

Figure 1A is a side view showing an integrally forged product of the flange, head, and constriction, Figure 1B is a side view showing a shaft forged product, and Figure 1C is a side view showing a stud manufactured by the present invention. Figure 2 is a cross-sectional view to explain the action of the stud, Figure 3 is a side view of a conventional stud, and Figures 4 and 5 show the stud in Figure 3 fitted with lining material. FIG. 1...Stud, 11...Brim part, 12...Shaft part, 13...Head part, 14...Narrow part.

Claims (1)

[Claims] 1. A method for manufacturing a stud having separate shafts and heads on both sides of the flange and a constriction between the flange and the head, which is an integrally forged product of the flange, head, and constriction. A method for manufacturing a stud, characterized by joining a forged shaft part.